Multiplex short tandem repeat amplification of low template DNA samples with the addition of proofreading enzymes

Abstract:  With <100 pg of template DNA, routine short tandem repeat (STR) analysis often fails, resulting in no or partial profiles and increased stochastic effects. To overcome this, some have investigated preamplification methods that include the addition of proofreading enzymes to the PCR cocktail. This project sought to determine whether adding proofreading polymerases directly in the STR amplification mixture would improve the reaction when little template DNA is available. Platinum Taq High Fidelity and GeneAmp High Fidelity were tested in Profiler Plus? STR reactions alone and in combination with AmpliTaq^® Gold. All reactions included the additional step of a post‐PCR purification step. With both pristine low template DNA and casework samples, the addition of these polymerases resulted in comparable or no improvement in the STR amplification signal. Further, stochastic effects and artifacts were observed equally across all enzyme conditions. Based on these studies, the addition of these proofreading enzymes to a multiplex STR amplification is not recommended for low template DNA work.     

Significance of additional RFLP single locus probes analysis after STR based determination of sibship

Autosomal STR typing alone seems to be no sufficient tool for resolving deficiency cases (e.g. cases of questioned paternity or half-sibships). Therefore, we investigated whether the additional analysis of RFLP single locus probes can improve the solution of such complicated kinship cases. We analyzed 207 children and men from 101 families using the AmpFlSTRIdentifiler multiplex PCR kit and three RFLP single locus probes. A comparison between each child and all unrelated men resulted in 11,023 man / child pairs. Less than three excluding STRs were found in 125 child / unrelated man pairs (1.13%). Additional analysis of RFLP results reduced the number of ambiguous cases to 35. Half-sibling pairs were simulated using STR results from 20 cases with high paternity probabilities (group 1) and relatively low paternity probabilities (group 2). Using a commercially available computer program we calculated probabilities for 778 half-sibling pairs. In 35 pairs (4.49%) half-sibling probabilities over 90.0% could be calculated. Additional investigation of RFLP single locus probes did not lead to a more reliable evaluation of these results. The combined investigation of autosomal STRs and RFLP single locus probes can satisfactorily solve deficient paternities but does not contribute to the solution of questioned half-sibships.     

The Reliability of Visually Comparing Small Frontal Sinuses*

Abstract: Several studies have investigated frontal sinus comparison for personal identification. One study addressed the statistical reliability of correct identification using automated digital methods and resulted in a 96% accuracy rate. Missed matches with the digital methods generally involved small, less featured sinuses. This study investigates the hypothesis that human examiners may be able to more accurately identify correct matches than digital methods, even when the comparisons involve small frontal sinuses. Participants were provided two sets of 28 radiographs and were instructed to identify matching radiographs and list the radiographs that did not have a corresponding match. Overall, error rates were low, with correct associations identified at a rate of 0.983. No incorrect associations (“false positives”) were made. Correct association rates were highest among participants “experienced” examining radiographs. Results support previous assertions that frontal sinus radiographs are a reliable means of personal identification even when the frontal sinuses are small.     

The influence of job assignment on community engagement: bicycle patrol and community-oriented policing

The purpose of this study is to compare a specialized community-oriented policing (COP) unit to a reactive unit on officer perceptions of public contact and officer perceptions of job performance. We also compare bicycle patrol officers to motor vehicle patrol officers within these units. Using a static group comparison design, questionnaires were distributed to officers within the Toronto Police Service (n = 178). Bicycle patrol is associated with more contacts with the public and higher rates of proactive policing when compared to motor vehicle patrol and bicycle officers are more likely to rate higher on several measures of crime control. Officers with a COP mandate engage with the public for a wider variety of reasons compared to those with a reactive mandate, and are more likely to rate higher on perceptions of performing job duties in a procedurally just manner. This study demonstrates the value of a specialized COP unit that includes bicycle patrol in achieving tenets of COP. It contributes to the literature on COP and the use of bicycle patrol in law enforcement by presenting the perspective of the police officer.     

Teaching Criminological Theory: The Power of Film and Music

Interest in utilizing pop culture as a means of teaching and enhancing students’ understanding of complex or abstract ideas in the classroom has increased over the course of the past decade. This includes the use of film, television, fiction books, the internet, and music. The fields of criminology and criminal justice have also increasingly noted the value of using such means to teach about atrocities such as state crime, transnational crime and corporate crimes as well as issues of inequality, racism, and classism. Film, music and television can also be great tools to enhance the understanding of and ability to apply criminological theory. Most articles that have focused on incorporating the use of a ‘popular criminology’ within the classroom, however, have concentrated on one form or another of ‘pop culture’ (i.e., film). This article seeks to add to the existing literature by providing an example of how the use of film combined with music can not only enhance undergraduate criminology and criminal justice students’ ability to grasp criminological theory and apply it in their everyday lives, but also can be utilized as tools for exams.     

The urban household in Russia and the Soviet Union, 1900–2000: Patterns of family formation in a turbulent century

Starting from census data on co-residence and household composition, the authors analyse principles of family organisation and family formation in twentieth-century urban Russia and the Soviet Union. The article uses an adapted version of the classification of households developed by Peter Laslett and Eugene Hammel to study variation in household structure for successive population censuses. Changes in this variation between cross-sections are explained with the help of additional quantitative and qualitative data and are linked to the fundamental demographic, social and economic shifts which took place in Russian society in the course of the twentieth century. The article finds a family system characterised by a tendency towards nuclear family formation, but incorporating a fairly stable element of household extension. Co-residence of three generations was both an answer to a perennial housing problem and offered important advantages in the sphere of childcare and care for the elderly. Variation and fluctuation in household structure are found to be most pronounced during the turbulent first half of the century. After a period of stability during the post-war decades of Soviet rule, post-Soviet transformations provoke new changes.     

Local response to federal changes in the housing voucher program: A case study of intraregional cooperation

Abstract

The desire to increase residential choice for Section 8 voucher clients resulted in the adoption of portability by the U.S. Department of Housing and Urban Development. Portability allows voucher holders to move between the jurisdictions of local housing authorities (HAs). InterHA cooperation could ease the administrative and financial burdens imposed by portability and improve service to voucher recipients. However, voluntary regional cooperation is rare.

This article presents a case study of a successful, voluntary, intraregional cooperative agreement among HAs. Theoretical and empirical analyses suggest that a cooperative agreement is more likely to develop voluntarily if two conditions are present: rational self‐interest and shared norms and trust among the managers. Agreements can ease the burdens associated with portability, but it is important for the parties to regularly assess implementation issues to ensure the agreement's continuing effectiveness. The article concludes with policy implications based on the findings from this research.     

Abjects or agents? Camps,contests and the creation of ‘political space’

The ‘Urdu-speaking population’ in Bangladesh, displaced by the Partition in 1947 and made ‘stateless’ by the Liberation War of 1971, exemplifies some of the key problems facing uprooted populations. Exploring differences of ‘camp’ and ‘non-camp’ based displacement, this article represents a critical evaluation of the way ‘political space’ is contested at the local level and what this reveals about the nature and boundaries of citizenship. Semi-structured and narrative interviews conducted among ‘camp’ and ‘non-camp’ based ‘Urdu-speakers’ found that citizenship status has been profoundly affected by the spatial dynamics of settlement. However, it also revealed the ways in which ‘formal’ status is subverted – the moments of negotiation in which claims to political being are made. In asking how and when a ‘stateless’ population is able to ‘access’ citizenship, through which processes and by which means, it reveals the tension, ambiguity and conceptual limitations of ‘statelessness’ and citizenship, unearthing a reality of partial, shifting and deceptively permeable terrain. In doing so, it also reveals the dissonance and discord (constitutive of an ‘us’ and ‘them’ divide) upon which the creation of ‘political space’ may rely. Citizenship functions to exclude and, therefore, it is very often born of contestation.     

Workshop Review: Export Controls of Space Systems

Experts from U.S. government agencies that administer export controls of space systems and representatives from non-governmental organizations and think tanks were invited in December 2014 to participate in an invitation-only workshop co-hosted by the Secure World Foundation and Astroconsulting International to discuss export controls with a delegation of industry representatives from The Society of Japanese Aerospace Companies. The underlying question when working on export controls is, with the increased access to space and burgeoning role of the private sector in space, how do you regulate this and encourage industry without harming national security? It is difficult to do this while supporting the space industrial base, as export control is perceived as a necessary part of shoring U.S. national security and assuring a stable and predictable space environment. A serious challenge is determining which technologies should be controlled: where do you draw the line? This is particularly the case for space technologies, many of which are dual-use. Countries also have to be careful of unintended consequences. Export control restrictions are extremely challenging to get “just right” and, as a result, should be undertaken only after a considerable amount of discussion with all stakeholders, including input from industry, and when the government has a solid understanding of what it is trying to accomplish via export control protections. Otherwise, the domestic industry can unduly suffer with very little benefit to national security.